This function takes in a ruleset and output the lower and upper bounds of each rule.
Usage
extrule(myrules, varname)
Arguments
myrules
A 3 column matrix output of function "hughs.path.rpart"
varname
the names of x variables
Value
A p*2 matrix, p is the length of varname. The first column is the lower bound, the second column is the upper bound. The default lower bound is "-Inf",the default upper bound is "Inf". row corresponse to x variables ordered in the data matrix given to rpart.